How would I use excel formulas like goalseek and sumproduct to fill this out?

How much can you borrow? What grade do you need? What's the IRR on this cash flow? 16,000.00 Grade Borrowed amount $ Term of loan (years) Interest rate (annual) Monthly payment 3.5% 92 78 86 Test Weight T1 20% T2 20% T3 20% FE 40% Weighted average Needed for A Needed for B Needed for C >> Period Net cash flow 0 $(75,000.00) 1 $ 17,000.00 2 $ 20,000.00 $ 11,000.00 4 $ 14,000.00 5 $ 12,000.00 6 $ 9,000.00 71 $ 15,000.00 8 $ 13,000.00 NPV IRR/Discount Rate IRR by Formula How much can you borrow? What grade do you need? What's the IRR on this cash flow? 16,000.00 Grade Borrowed amount $ Term of loan (years) Interest rate (annual) Monthly payment 3.5% 92 78 86 Test Weight T1 20% T2 20% T3 20% FE 40% Weighted average Needed for A Needed for B Needed for C >> Period Net cash flow 0 $(75,000.00) 1 $ 17,000.00 2 $ 20,000.00 $ 11,000.00 4 $ 14,000.00 5 $ 12,000.00 6 $ 9,000.00 71 $ 15,000.00 8 $ 13,000.00 NPV IRR/Discount Rate IRR by Formula